Button Color Change on Ampere-change

Dear all, I have a smart plug MSS310 which shows the volage, ampere and watt in HA. My dryer is connected to it.
I want to put a MatterialDesign-Button on my lovelace which shows the current state.
for example: If machine uses less then 0.9A - status is ready, or if machine uses more than 1A - status is working, and if machine is using 0A - its off.
I tried arround with

    name: Dryer Status
      - off
      - working
      - ready
    initial: aus

But i have no idea how to picture different icons (red, green, grey) depending on what Ampere the dryer is used… hope u can help